Please give a list of manialinks which are not reachable at the moment.

At the moment, e.g. "maniahome" is working fine for me.

If IE is not disabled and not offline, but things are blocked with ManiaPlanet "only", I think it is rather your firewall or antivirus which is hindering proper functionality.
Double or better triple-check their configuration. Also try disable them just for the time of a new trial to see if they are the culprits

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No problem, I can understand you, and I also feel sorry because I don't always have the right answer.

But the strange thing is, I never had such issues, on both of my current PCs (one higher end machine with nVidia card, and one laptop with realtively poor AMD Radeon mobile graphics, both with Windows 7 ).
It only happened a few times that the game was suddenly stuttering after the updates, most likely because some settings in the config file have been changed or became invalid with the update. The solution here was to delete the config file, and readjust some settings carefully, that's it.
But never connection problems like yours. If there was a connection problem, then one time because the master server was unavailable, but this is not the case actually (luckily for all the others).

I really presume that your security programs like avast, fsecure, defender, whatever, except Avira Antivirus Pro (I know it works with Avira, because I use that), or perhaps firewalls have blocked Maniaplanet.
Why? Because all major updates install a new ManiaPlanet.exe, which is normally recognized as potential risk.
So if some people ignore or forget the firewall message ("Maniaplanet wants to access... allow or not?") that appears in the background (easily overseen in fullscreen mode), then some features will be blocked.
Second possible issue, at the restart of the game, if it is not started with Admin rights, it can't configure the system adequately, and perhaps some things don't work anymore here.

You know, I'm also very interested to find or to get to know the solution.
And I hope you, or Nadeo, find it very soon!

Until then, please double check your configuration.
If possible, try another PC in the same network, or try your PC in a different network, to see if there is a different behavior.

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Uninstall/Reinstall = No Change
Firewall on = No Change
Firewall off = No Change

Aside from the standard Firewall, Malwarebites is my only virus protection and it's not blocking anything from the game. Internet Explorer, even though I do not use it, it is not offline. I don't mean any disrespect, but for the matter at hand, if there is no problems before the update, but then problems surface when an update occurs, then the problem is the game. The update triggered something when it should not have, and just because it doesn't happen to you, doesn't make it fool proof for everyone else. It's could be the game files were corrupted or something in the files changed that shouldn't have, Could have even triggered something outside the game.

As mentioned, Trackmania United Forever is running perfectly fine, but ManiaPlanet is the one having issues for some unknown reason.

Anyways, this reinstall, I was prompted to update, I will try reinstalling again, maybe tomorrow without updating to see if it works again.

EDIT:;: So I did a second reinstall, even followed with a defrag and cleanup before reinstalling, and aside from downloaded skins and my maps, all files deleted. Tried to avoid updating but it's not possible. Upon reinstalling, when you open the game, you are prompted with a Compulsory ManiaPlanet v1.41020(86.42MB) update. After Restarting, all other games are there but opening or selecting Play for them won't work as before with the exception of Stadium. Upon Selecting Play for Stadium you are prompted with another Compulsory Update v1.41020(572.2MB).